from datetime import datetime
from django.shortcuts import render
from rest_framework.decorators import action
from rest_framework.generics import CreateAPIView, RetrieveAPIView, UpdateAPIView

from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.permissions import IsAuthenticated
from rest_framework import status
from rest_framework.mixins import CreateModelMixin, UpdateModelMixin, ListModelMixin
from rest_framework.viewsets import GenericViewSet, ViewSetMixin
from rest_framework import serializers
from django_redis import get_redis_connection
from rest_framework_jwt.views import ObtainJSONWebToken

from .models import User, Address
from .serializers import UserDetailSerializer, EmailSerializer, CreateUserSerializer, AddressSerializer, \
    AddressTitleSerializer
from .serializers import UserBrowseHistorySerializer
from goods.serializers import SKUSerializer
from goods.models import SKU
from carts.utils import merge_cart_cookie_to_redis
from rest_framework_jwt.settings import api_settings


# Create your views here.
class UserView(CreateAPIView):
    """注册"""
    # 指定序列化器
    serializer_class = CreateUserSerializer

    def post(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)

        serializer.is_valid(raise_exception=True)
        user = serializer.save()
        response = Response(serializer.data, status=status.HTTP_201_CREATED)
        merge_cart_cookie_to_redis(request, user, response)

        return response


class UsernameCountView(APIView):
    """判断用户名是否已存在"""

    def get(self, request, username):
        # 用username去User模型中查询此用户名的数据
        # try:
        #     count = User.objects.filter(username=username).count()
        # except try:

        count = User.objects.filter(username=username).count()

        data = {
            'username': username,
            'count': count
        }
        # 响应
        return Response(data)


class MobileCountView(APIView):
    """判断手机号是否已经存在"""

    def get(self, request, mobile):
        # 用mobile去User模型中查询此用户名的数据
        count = User.objects.filter(mobile=mobile).count()
        data = {
            'mobile': mobile,
            'count': count
        }

        return Response(data)


class UserDetailView(RetrieveAPIView):
    """展示用户个人信息"""
    ## 指定序列化器类
    serializer_class = UserDetailSerializer

    # queryset = User.objects.all()
    # def get_object(self):
    # instance = self.get_object()  Retrieve 扩展中此行代码由于路由中没有Pk所以此方法获取不到查询集中的单个模型对象
    # 指定视图的权限
    permission_classes = [IsAuthenticated]

    def get_object(self):
        # 重写获取单一模型对象的方法,手动从请求对象获取user 并返回
        return self.request.user


# PUT /email/
class EmailView(UpdateAPIView):
    """设置邮箱"""

    # 指定序列化器
    serializer_class = EmailSerializer

    # 指定视图的权限
    permission_classes = [IsAuthenticated]

    # 重写get_object方法返回user对象
    def get_object(self):
        return self.request.user


# GET //
class VerifyEmailView(APIView):
    """激活邮箱"""

    def get(self, request):
        # 1. 获取前端传入查询参数
        token = request.query_params.get('token')
        # 1,1 如果token没有提取，响应
        if not token:
            return Response({'message': '没有token'}, status=status.HTTP_400_BAD_REQUEST)

        # 2.对获取到的token进行解密，并且查询user
        user = User.check_verify_email_token(token)
        # 3. 判断是否获取出user， 如果没有，就响应
        if not user:
            return Response({'message': 'token无效'}, status=status.HTTP_400_BAD_REQUEST)
        # 4. 修改user对象的email_active字段为True

        user.email_active = True
        user.save()
        # 响应
        return Response({'message': 'ok'})


class AddressViewSet(CreateModelMixin, UpdateModelMixin, GenericViewSet):
    """用户收货地址增删改查"""

    # 指定序列化器
    serializer_class = AddressSerializer
    # 指定权限
    permission_classes = [IsAuthenticated]

    def get_queryset(self):
        return self.request.user.addresses.filter(is_deleted=False)

    # POST /addresses/  保存数据到数据库
    def create(self, request, *args, **kwargs):
        # 判断当前用户的收货地址数据,是否上限,如果上限直接响应
        count = request.user.addresses.count()
        if count >= 20:  # 判断地址上限,不能超过20个
            return Response({'message': '用户收货地址达到上限'}, status=status.HTTP_400_BAD_REQUEST)

        return super(AddressViewSet, self).create(request, *args, **kwargs)

    # GET /addresses
    def list(self, request, *args, **kwargs):
        """获取用户地址列表数据"""

        queryset = self.get_queryset()
        # 创建序列化器对象
        serializer = self.get_serializer(queryset, many=True)
        user = self.request.user
        return Response({
            'user_id': user.id,
            # 'default_address_id': user.default_address_id,
            'limit': 20,
            'addresses': serializer.data,
        })

    # delete /addresses/<pk>/
    def destroy(self, request, *arge, **kwargs):
        """处理删除"""
        address = self.get_object()

        # 进行逻辑删除
        address.is_deleted = True
        address.save()

        return Response(status=status.HTTP_204_NO_CONTENT)

    # put /addresses/pk/status/
    @action(methods=['put'], detail=True)
    def status(self, request, pk=None):
        """设置默认的地址"""
        address = self.get_object()
        request.user.default_address = address
        request.user.save()
        return Response({'message': 'OK'}, status=status.HTTP_200_OK)

    # put /addresses/pk/title/
    # 需要请求体参数 title
    @action(methods=['put'], detail=True)
    def title(self, request, pk=None):
        """修改标题"""

        address = self.get_object()
        serializer = AddressTitleSerializer(instance=address, data=request.data)
        serializer.is_valid(raise_exception=True)
        serializer.save()
        return Response(serializer.data)


class UserBrowseHistoryView(CreateAPIView):
    """保存用户浏览记录"""
    """获取当前用户的浏览记录"""
    # 指定用户权限
    permission_classes = [IsAuthenticated]

    # 指定序列化器
    serializer_class = UserBrowseHistorySerializer

    def get(self, request):
        """获取用户浏览记录"""
        # 1.创建redis连接对象
        redis_conn = get_redis_connection('history')
        # 获取当前的请求用户
        user = request.user
        print('view中的request----- %s' % request)

        # 调用lrange() 获取当前用户的浏览记录
        # lrange(self, name, start, end):
        sku_id_list_bytes = redis_conn.lrange('history_%s' % user.id, 0, -1)
        # 通过sku_id取出一个一个的sku模型
        # SKU.objects.filter(id__in=sku_id_list_bytes)
        sku_list = []  # 为了保存浏览商品的顺序只能自己遍历一个一个查和添加到列表
        for sku_id_bytes in sku_id_list_bytes:
            print(sku_id_bytes)

            sku = SKU.objects.get(id=sku_id_bytes)
            print(sku)
            sku_list.append(sku)

        # 把模型进行序列化 ， 创建序列化器时，
        # instance 参数可以传递 模型对象, 字典  (查询集/列表   many=True)
        serializer = SKUSerializer(sku_list, many=True)

        return Response(serializer.data)


jwt_response_payload_handler = api_settings.JWT_RESPONSE_PAYLOAD_HANDLER


class UserAuthorizeView(ObtainJSONWebToken):
    """自定义jwt登录视图"""

    def post(self, request, *args, **kwargs):

        serializer = self.get_serializer(data=request.data)

        if serializer.is_valid():
            user = serializer.object.get('user') or request.user
            token = serializer.object.get('token')
            response_data = jwt_response_payload_handler(token, user, request)
            response = Response(response_data)
            if api_settings.JWT_AUTH_COOKIE:
                expiration = (datetime.utcnow() +
                              api_settings.JWT_EXPIRATION_DELTA)
                response.set_cookie(api_settings.JWT_AUTH_COOKIE,
                                    token,
                                    expires=expiration,
                                    httponly=True)
            # 账号密码登录合并购物车
            merge_cart_cookie_to_redis(request, user, response)
            return response

        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
